Certain investigations on Throughput improvement of OFDM MIMO system

Abstract

One of the most challenging issues for future wireless newlinecommunications is to support a large number of subcarriers and ensure the newlinefulfillment of QoS Quality of Service requirements in terms of Bit Error newlineRate BER and data rate for the given limited availability of frequency newlineSpectrum High data rate wireless communications have attracted significant newlineinterest and constitute a significant research challenge in the environment of newlinethe emerging Wireless Local Area Networks WLANs Specifically the newlineemployment of multiple antennas at both the transmitter and the receiver newlinecalled the Multi Input Multi Output MIMO technique constitutes to high newlinethroughput wireless communications MIMO can be combined with any newlinemodulation techniques Recent researches suggests that the implementation of newlineMIMO with Orthogonal Frequency Division Multiplexing OFDM called newlineOFDM MIMO system proves more efficient in terms of capacity newline transmission rate and coverage transmission range newlineSubstantial research is on the anvil in WLAN and trump cards have newlinesurfaced up at this laborious work In this momentous wireless newlinecommunication system fast adaptive transmission has been pinpointed as a newlinekey throughput technology Fast adaptive transmission is performed and newlineaccomplished by resource allocation techniques The modus operandi for this newlineresource allocation technique in the multiuser OFDM MIMO system are two newlinetypes namely fixed resource allocation and the dynamic resource allocation newlineOn collation it has been noticed that the former is not optimal as the scheme is newlineConstant regardless of the present channel condition while the later has the newlinegreat interest due to the time varying nature of the wireless channel The newlinesystem performance can be elevated by proper allocation of resources newlineamongst the users The OFDM MIMO system for WLAN is proposed to newlineOptimize Dynamic Resource Allocation Rate Adaptive Algorithm newline newline